What are Cluster OS Rolling Upgrades in Windows Server 2016? How do these impact Windows Server Hosting? For the uninitiated, it is important that they know something about Clustering. Failover Clustering as far as Windows Server is concerned goes all the way back to Windows NT. The feature was developed to keep servers and their underlying applications and workloads running, even if a node in the cluster were to fail. Clustering ensures that high uptime requirements and Service Level Agreements are met. Also, new capabilities such as live migration make the service running on a cluster more resilient and agile as cluster nodes need to be drained and rebalanced whereas apps, processes and services continue running. The only challenge confronting cluster management until now was upgrading the underlying host operating systems on cluster nodes. Windows Server 2016 Clustering accounts for a mixed OS Mode. This implies that as far as individual clusters are concerned, nodes can run Windows Server 2012 R2 as well as Windows Server 2016. The Mixed OS Node enables the end user to drain cluster nodes and upgrade their operating systems one-by-one until all cluster nodes are at Windows Server 2016. From here on, clusters can be upgraded in-place without having to stand up and migrating workloads into a net-new cluster. A simple PowerShell cmdlet is used to update the cluster functional level. This is good news for both end users as well as service providers offering Windows Dedicated Server Hosting Services.
The process can involve taking a node offline, upgrading it, re-adding the node and subsequently repeating the whole process for each server in the cluster. In case a situation arises where the cluster node cannot be taken offline because of capacity or SLA constraints, then a temporary node can be added to the cluster and the process mentioned above be followed. The added node can then be removed once the job is over by the contracted service provider in charge of Best Dedicated Server Hosting Services. The process as such may seem pretty straightforward but at the same time, what has to be realized is that it might get a little too manual or perhaps script-reliant for use on larger clusters or if there are several clusters in need of an upgrade. To counter this, the System Center Virtual Machine Manager can be used and so can the built-in support for Cluster OS Rolling Upgrade, tasked to automate the entire process and upgrade the functional level.
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